Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1977-03-18
1980-07-22
Smith, Jr., David
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361187, H01F 718
Patent
active
042142903
ABSTRACT:
A control circuit for controlling the current supplied from a d.c. source such as a battery to the actuating coil of an electromagnetically operated contactor, comprising switching means such as a transistor operable repetitively to connect the coil to and disconnect the coil from the source, and control circuit means for varying the mark-to-space ratio of the switching thereby to vary the mean voltage applied to the coil. The mean voltage can be controlled so that the mean current through the coil when the contactor is closed remains substantially constant irrespective of the voltage of the battery, so that the same contactor and control circuit can be used with a number of batteries of different voltages.
REFERENCES:
patent: 3237088 (1966-02-01), Karp et al.
patent: 3549955 (1970-12-01), Paine
patent: 3737736 (1973-06-01), Stampfli
patent: 3786314 (1974-01-01), Misch
patent: 3878446 (1975-04-01), Brandt
patent: 3944900 (1976-03-01), Rohsler
patent: 4016459 (1977-04-01), Boehringer
patent: 4041546 (1977-08-01), Stewart
patent: 4048665 (1977-09-01), Lia et al.
Rosen Alfred H.
Sevcon Limited
Smith Jr. David
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